Portable turntable



Maf. 27, 1923,

l G. H. -MaCLEAN PORTABLE TURNTABLE ets-sheet -2 Mar. 272x923 G. H. MaCLEAN PORTABLE TURNTABLE y www? A run upon it.

y, 'Patented Mar. 2?-, 1923. i

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PATEN oFFic GEORGE H. MACLEAN, OF NEW HAVEN, CONNECTICUT.

PORTABLE TURNTABLE.

application inea november 2o, 1922. serial No. 602,278.

. and which said drawings constitute part of this application, and represent, in-

F ig. 1 a side view of a turntable con- 16;structed in accordance with my invention, i and shown with the table tilted and a truck Fig. 2 a broken view in side elevation on a larger scale.

Fig. 3 a 'corresponding plan view.

Fig. 4 an Vendview looking from the right of Fig. 3.

Fig. 5 av transverse sectional view on the line 5-5 of Fig. 3.

portable turntables particularly adapted for. autotrucks,A and especially designed for use in road-building. In road building, unless a turntable is employed, it has been necessary to turn the 'truck around before dumping, as "roads are usually builtin sectionsperhaps half -the width' of the roadwaythe' turning space .is limited, consequently, `it has been necessary to turn the truck at a point some distance away from the point of dumpinof vand back the truck to the desired point; s the workprogresses, it is obvious .that the turntable must be portable. In building a road, forms are usually employed on opposite sides, upon which the wheels, on which the turntable is mounted, may travel, butjthese forms are'not adapted to sustain the weight of a. turntable with a truck upon it. 'F-urthermore, it is desirable that the platformshouldbe capable of tilting from fone endl to the other, not only to facilitate the `movement of a truck upon the platform, f'but to', compensate for grade.

' The objects of this invention are to pron {vide a portable turntable especially adapted foruauto trucks, to provide means for removing the weight from the forms or wheels on vsfliichv the turntable is supported, and impose'it upon the roadway, and another Vole- Aject is to lprovide hydraulic control for the platform, so that one end or the other may be raised or lowered as desired, and the invention consists inthe construction as will be .hereinafter described and particularlyl reclted 1n the claims.

In `carrying out my invention, I form a -platform with two runways 10 and 11 formed from planking arranged between two pairs o f channel irons l2 and 13. These channel irons are provided midway of their length with bearings 14 for stub-shafts 15, winch are lsupported in -bearings 16which rest upon I -beams 17 supported by a-ring 18 resting on a series of tapering rollers v19 bearing in A.channels 20 of a' bedfpiece 21., The bed-p1ece is provided on four lsides with outwardly-projecting lugs 22. Two of .these lugs are suspended by clips-23 from the center of two side springs 24, the ends of which being connected with shackles 25 se-jfjffjjn cured tothe sidebars 26 of the frame, and the other two lugs are connected in a similar way with springs 27, the endsl of which being connected with shackles 28 supported 25 This invention relates to improvements 1n.

by transverse bars 29.

and worm-wheel 32.provided with a crank` v 33. The opposite end is supported by wheels 34 mounted on short i ed to theside-bars 26 of the frame. The inner ends of the axles are coupled by a pin' 36 and slot 37 with a vcross-piece 38 of a steering-handle 39. Mounted in transverse frames 40 are two pairs of cylinders 41 and 42,. and pivotally mounted on the platform pistons 43 and 44, which enter the cylinders.' The two pairs ofjcylindersare connected by a pipe 45, in which is a valve 46, the stem of which is provided With a handlel 47 which extends outto one side for .convenience of access. Preparatory to `having a truck run onto the platform, the valve 46 4will be operated to permit one end of the l loaded truck is run upon the platform, the

weight-depresses the springs 24 andv 27, which permits the bed-spring to be def pressed onto the ground or sub-grade, and'.

thus relieving the.' wheels'from the weight of the load.'..Assumingthe truck has been runl onto the platform suiiiciently far to over-balance the platform and bring the f the platform on which the forward end oi.

matarity of the load at the high end, the vente 6 will then be operated t-o allow oil from the cylinders 4l to pass to the cylinders 42 and thus gradually' bring the platform to a substantially horizontal position, and when the desired position islattained, the valve will be closed to prevent further movement, The platform is then turned on the bedpiece to reverse the position of the truclr. The truck is-t-hen dumped either in its first po: 'tion ontlie platform,or it may -be backed he. end thereof, vand, if necessary, the rm may be tilted so as to lower the end of the truck-before dumping. Bifdumping, the truck willv be moved so as to over-balancc the platform; rEhe valve lf3 will again be operated to permit that end of l:

the truck rests, to be depressed, so that the truclr may run off onto the roadway in the direction in which it approached. rl`he platform is then in position for the reception of another truck. Then the truck passes off the platform, the springs react so as to lift the bed-piece above the ground, leaving the device supported by the'wheels 30 and 34 by which it may be gmoved forward.

lt will thus be seen that when a loaded truck upon the turntable, the weight is imposed upon the ground, or sub-grade, and not upon the forms at opposite sides; and that Athe inclination of the truck may be changed as is necessary to permit the truck to ride upon or off from the platform, irrespective of the inclination of the grade of the roadway.

l claim:

l. ln a turntable, the combination with a platform,l of a bedpiece with which the platform is pivotally connected, a frame from which the bed-piece is suspended. said frame provided with wheels, and springs between the bed-piece and frame, whereby, when a load is imposed upon the platform, the springs will yield to permit the bedpieceto be depressed.

` 2. ln-a turntable, the. combina-tion with a platform, of a bed-piece with which the platform is pivotally connected, a frame from which the bed-piece is suspended, said 'frame provided'iwith wheels, springs between the bed-piece and frame, whereby, when a load is imposed upon the platform, the springs will yield to permit the bed piece to be depressed, and hydraulic means for controlling the inclination of the platform.

8. ln a turntable, the combination with a platform, of a bed-piece to which the platform is pivot-ally connected, ofcylinders on opposite sides of the pivotal point, pistons connected with the platform 'and coeactinp; with the said cylinders, the cylinders at one side of the pivot being connected with the cylinders of the opposite side, and means interposed between the cylinders to regulate the flow of fluid between. them.

4f. In a turntable, the combination with a platform, of a bed-piece to which the platform is pivotally connected, of cylinders on opposite sides of the pivotal point, pistons connected with the platform and cio-acting with the said cylinders, the cylinders at one side of the pivot being connected with the cylinders of the opposite side, means inter posed between the cylinders to regulate the flow of duid between them, and springs bctween the bed-piece and platform.

5. Ina turntable, the combination with a platform, of a bed-piece with which the platform is pivotally connected, a frame supported by wheels, springs between the bed-piece and frame, permitting the bedpiece and table to be depressed, and hydraulic means to adjust the inclination of the table.

ln testimony whereof, l have signed this speciication in the presence of two subscribingr witnesses.

GEORGE ll. MMILE TWitnesses MALCOLM P. hlioiroiis.

llrrrrriscron. 

